Board Paper of Class 10 2017 Science (SET 3) - Solutions
(i) The questions paper comprises two section, A and B. You are to attempt both the sections.
(ii) All questions are compulsory.
(iii) There is no choice in any of the questions.
(iv) All questions of Section A and all questions of Section B are to be attempted separately.
(v) Question numbers 1 to 3 in Section A are one mark questions. These are to be answered in one word or one sentence.
(vi) Question numbers 4 to 6 Section A are two marks questions. These are to be answered in about 30 words each.
(vii) Question numbers 7 to 18 in Section A are three marks questions. There are to be answered in about 50 words each.
(viii) Question numbers 19 to 24 in Section A are five marks questions. These are to be answered in about 70 words each.
(ix) Question number 25 to 33 in Section B are multiple choice questions based on practical skills. Each question is a one mark question. You are to select one most appropriate response out of the four provided to you.
(x) Question numbers 34 to 36 in Section B are two marks questions based on practical skills. These are to be answered in brief.
(ii) All questions are compulsory.
(iii) There is no choice in any of the questions.
(iv) All questions of Section A and all questions of Section B are to be attempted separately.
(v) Question numbers 1 to 3 in Section A are one mark questions. These are to be answered in one word or one sentence.
(vi) Question numbers 4 to 6 Section A are two marks questions. These are to be answered in about 30 words each.
(vii) Question numbers 7 to 18 in Section A are three marks questions. There are to be answered in about 50 words each.
(viii) Question numbers 19 to 24 in Section A are five marks questions. These are to be answered in about 70 words each.
(ix) Question number 25 to 33 in Section B are multiple choice questions based on practical skills. Each question is a one mark question. You are to select one most appropriate response out of the four provided to you.
(x) Question numbers 34 to 36 in Section B are two marks questions based on practical skills. These are to be answered in brief.
- Question 1
Write the molecular formula of the 2nd and 3rd member of the homologous series where the first member is ethyne. VIEW SOLUTION
- Question 2
Why is variation important for a species? VIEW SOLUTION
- Question 3
In the following food chain, 20,000 J of energy was available to the plants. How much energy would be available to man in this chain?
VIEW SOLUTION
- Question 4
An object is placed at a distance of 15 cm from a concave lens of focal length 30 cm. List four characteristics (nature, position, etc.) of the image formed by the lens. VIEW SOLUTION
- Question 5
You being an environmentalist are interested in contributing towards the conservation of natural resources. List four activities that you can do on your own. VIEW SOLUTION
- Question 6
Why are coal and petroleum categorised as natural resources? Give a reason as to why they should be used judiciously. VIEW SOLUTION
- Question 7
Distinguish between esterfication and saponification reaction with the help of the chemical equations for each. State one use of each (i) esters, and (ii) saponification process. VIEW SOLUTION
- Question 8
Write the structural formula of ethanol. What happens when it is heated with excess of conc. H2SO4 at 443 K? Write the chemical equation for the reaction stating the role of conc. H2SO4 in this reaction. VIEW SOLUTION
- Question 9
What is periodicity in properties of elements with reference to the Modern Periodic Table? Why do all the elements of the same group have similar properties? How does the tendency of elements to gain electrons change as we move from left to right in a period? State the reason of this change. (3) VIEW SOLUTION
- Question 10
Write the electronic configuration of two elements X and Y whose atomic numbers are 20 and 17 respectively. Write the molecular formula of the compound formed when element X reacts with element Y. Draw electron-dot structure of the product and also state the nature of the bond formed between both the elements. (3) VIEW SOLUTION
- Question 11
How did Mendel explain that it is possible that a trait is inherited but not expressed in an organism? VIEW SOLUTION
- Question 12
What is an organic evolution? It cannot be equated with progress. Explain with the help of a suitable example. VIEW SOLUTION
- Question 13
List the two types of reproduction. Which one of the two is responsible for bringing in more variations in its progeny and how? VIEW SOLUTION
- Question 14
What is vegetative propagation? State two advantages and two disadvantages of this method. VIEW SOLUTION
- Question 15
List three techniques that have been developed to prevent pregnancy. Which one of these techniques is not meant for males? How does the use of these techniques have a direct impact on the health and prosperity of a family? (3) VIEW SOLUTION
- Question 16
"A lens can form a magnified erect image as well as magnified inverted image of an object placed in front of it." State the nature of this lens and draw ray diagrams to justify the above statement. Mark the positions of O, F and 2F in the diagram. VIEW SOLUTION
- Question 17
What is "dispersion of white light"? Draw a labelled diagram to illustrate the recombination of the spectrum of white light. Why is it essential that the two prisms used for the purpose should be identical and placed in an inverted position with respect to each other? VIEW SOLUTION
- Question 18
(a) Water is an elixir of life, a very important natural resource. Your Science teacher wants you to prepare a plan for a formative assessment activity, "How to save water, the vital natural resource". Write any two ways that you will suggest to bring awareness in your neighbourhood, on 'how to save water'.
(b) Name and explain any one way by which the underground water table does not go down further. VIEW SOLUTION
- Question 19
With the help of one example for each, distinguish between the acquired traits and the inherited traits. Why are the traits/experiences acquired during the entire lifetime of an individual not inherited in the next generation? Explain the reason of this fact with an example. VIEW SOLUTION
- Question 20
(a) Write the functions of each of the following parts in a human female reproductive system:(i) Ovary
(ii) Uterus
(iii) Fallopian tube
(b) Write the structure and functions of placenta in a human female. VIEW SOLUTION
- Question 21
Why are certain compounds called hydrocarbons? Write the general formula for homologous series of alkanes, alkenes and alkynes and also draw the structure of the first member of each series. Write the name of the reaction that converts alkenes into alkanes and also write a chemical equation to show the necessary conditions for the reaction to occur. VIEW SOLUTION
- Question 22
A student suffering from myopia is not able to see distinctly the objects placed beyond 5 m. List two possible reasons due to which this defect of vision may have arisen. With the help of ray diagrams, explain
(i) why the student is unable to see distinctly the objects placed beyond 5 m from his eyes.
(ii) the type of the corrective lens used to restore proper vision and how this defect is corrected by the use of this lens.
(b) If, in this case, the numerical value of the focal length of the corrective lens is 5 m, find the power of the lens as per the new Cartesian sign convention. VIEW SOLUTION
- Question 23
Analyze the following observation table showing variation of image-distance (v) with object-distance (u) in case of a convex lens and answer the questions that follow without doing any calculations :
S. No. Object-Distance
u (cm)Image-Distance
v (cm)1 –100 +25 2 –60 +30 3 –40 +40 4 –30 +60 5 –25 +100 6 –15 +120
(a) What is the focal length of the convex lens? Give reason to justify your answer.
(b) Write the serial number of the observation which is not correct. On what basis have you arrived at this conclusion?
(c) Select an appropriate scale and draw a ray diagram for the observation at S.No. 2. Also find the approximate value of magnification. VIEW SOLUTION
- Question 24
(a) If the image formed by a mirror for all positions of the object placed in front of it is always diminished, erect and virtual, state the type of the mirror and also draw a ray diagram to justify your answer. Write one use such mirrors are put to and why.
(b) Define the radius of curvature of spherical mirrors. Find the nature and focal length of a spherical mirror whose radius of curvature is +24 cm. VIEW SOLUTION
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